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  <title>增加数值元素的值</title>
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  <div id="layout-content"><div id="memcached.increment" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">Memcached::increment</h1>
  <p class="verinfo">(PECL memcached &gt;= 0.1.0)</p><p class="refpurpose"><span class="refname">Memcached::increment</span> &mdash; <span class="dc-title">增加数值元素的值</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-memcached.increment-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>Memcached::increment</strong></span>(<span class="methodparam"><span class="type">string</span> <code class="parameter">$key</code></span>, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code><span class="initializer"> = 1</span></span>): <span class="type">int</span></div>

  <p class="para rdfs-comment">

   <span class="function"><strong>Memcached::increment()</strong></span>
   将一个数值元素增加参数 <code class="parameter">offset</code> 指定的大小。如果元素的值不是数值类型，将返回错误。如果元素不存在，
   <span class="function"><strong>Memcached::increment()</strong></span> 会将元素设置成
   <code class="parameter">initial_value</code> 指定的值。
  </p>
 </div>



 <div class="refsect1 parameters" id="refsect1-memcached.increment-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">key</code></dt>

     <dd>

      <p class="para">
       要增加值的元素的 key。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">offset</code></dt>

     <dd>

      <p class="para">
       要将元素的值增加的大小。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">initial_value</code></dt>

     <dd>

      <p class="para">
       如果元素不存在，要设置的默认值。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">expiry</code></dt>

     <dd>

      <p class="para">
       设置元素值的过期时间。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-memcached.increment-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回元素的新值 或者在失败时返回 <strong><code>false</code></strong>。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-memcached.increment-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4404">
    <p><strong>示例 #1 <span class="function"><strong>Memcached::increment()</strong></span> 示例</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$m&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">Memcached</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$m</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">addServer</span><span style="color: #007700">(</span><span style="color: #DD0000">'localhost'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">11211</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$m</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">set</span><span style="color: #007700">(</span><span style="color: #DD0000">'counter'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$m</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">increment</span><span style="color: #007700">(</span><span style="color: #DD0000">'counter'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$n&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$m</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">increment</span><span style="color: #007700">(</span><span style="color: #DD0000">'counter'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">10</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$n</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$m</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">set</span><span style="color: #007700">(</span><span style="color: #DD0000">'counter'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'abc'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$n&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$m</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">increment</span><span style="color: #007700">(</span><span style="color: #DD0000">'counter'</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">//&nbsp;^&nbsp;will&nbsp;fail&nbsp;due&nbsp;to&nbsp;item&nbsp;value&nbsp;not&nbsp;being&nbsp;numeric<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$n</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
int(11)
bool(false)
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-memcached.increment-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="methodname"><a href="memcached.decrement.html" class="methodname" rel="rdfs-seeAlso">Memcached::decrement()</a> - 减小数值元素的值</span></li>
    <li class="member"><span class="methodname"><a href="memcached.decrementbykey.html" class="methodname" rel="rdfs-seeAlso">Memcached::decrementByKey()</a> - Decrement numeric item's value, stored on a specific server</span></li>
    <li class="member"><span class="methodname"><a href="memcached.incrementbykey.html" class="methodname" rel="rdfs-seeAlso">Memcached::incrementByKey()</a> - Increment numeric item's value, stored on a specific server</span></li>
   </ul>
  </p>
 </div>


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